Telephone system



H. P. CLAUSEN ET AL TELEPHONE SYSTEM Filed Dec. 28 1918 hie/7 ryf? G/flMen Char/ea L. Gwarum Patented 9st. 30, 1923., I

HENRY r. CLAUSEN, or Mo NT vEa oN, AND onAnrl'Es GOODRUM, on EW YORK, N.Y., AssIeNoRs- TO WESTERN ELECTRIC COMPANY, INCORPORATED,- or NEW YORK,N. Y., A ooRPoRArIoNor NEW YORK.

TELEPHONE sYsTnM.

Application filed December 28, 1918., Serial No. 268,664.

To all whom it may concern:

Be it known that we, HENRY P. CLAUSEN and Crrannns L. GooDRuM, citizensof the United States, residing at Mount Vernon in the county ofWestchester and State of New York, and at New York, in the county of NewYork and State of New York, respectively, have invented certain new anduseful Improvements in Telephone Systems, of which the following is afull, clear, concise, and exact description.

This invention relates to improvements in telephone exchange systems andhas particular reference to a circuit arrangement for controllingautomatic switches over long distant trunks.

In patent to H. P. Clausen and C. I1. Groodrum, No. 1,396,730,-datedNovember 15, 1921, means are provided at one station for controlling theoperation of an automatic switch at a distant station over a controllingcircuit common to a plurality of telephone circuits whereby a connectionmay be established between a calling and a called line over one of saidtelephone circuits. In this arrangement, automatic switches are operatedonly from one end of the controlling circuit by a mechanism associatedwith an operators position at the other end of said circuit.

An object of the present invention is to provide a novel arrangementwhich permits of automatic switches at'each end of a common controllingcircuit to beoperated'by impulses simultaneously transmitted fromopposite ends of said circuit.

The inventive idea involved is capable of receiving a variety ofexpressions, one of which, for the purpose of illustrating theinvention, is shown in the accompanying drawing; but it is to beexpressly understood that said drawing is employed merely for thepurpose of facilitating the description of the invention as a whole, andnot to define the limits thereof, reference being had to the appendedclaims for'this purpose.

The drawing illustrates diagrammatically the circuit arrangementembodying the present invention. r

In the present embodiment; ofthe invention use is preferably made ofdistributors operating in synchronism and controlled by a duplexsys'tem,-such as used in printing telegraphy, to transmit impulses fromeither end of a common controlling circuit to the other end thereof foroperating automatic switches which connecta calling subscriber with acalled subscriber over one of'a plurality of telephone circuits to whichsaid controlling circuit is common;

In the drawing, 1 and 2 indicate two of a group of telephone circuits.employed to complete a connection from station A to station B, while 3and 4 indicate telephone circuits ofa group which maybe utilized tocomplete a connection from station B to stat onA. A controlling circuitorconduci tor 5 common to both groups of telephone circuits, is providedover which impulses maybe transmitted in both directions to operateautomatic switches (not shown) connected to the ends of said controllingcircuit, Associated with the groups of telephone circuits, includingtrunks1 and 2, are distributors 6 and 7 rendered effective to cause thetransmission of impulses over the conductor 5 from station A towardsstation B. Likewise, distributors 8 and.9 are associated with the groupof telephone circuits including trunks?) and 4: and operate totransmitvimpulses over conductor 5 from station B whereby switches (notshown) at station Aniay be set. The two sets of distributorsarepreferably of a type employed in printing telegraphy and are operatedin synchronism in any well known manner. An operators position atstation A is provided with a mechanism conventionally shown at 10, whichis operated in accordance with the impulses to be transmitted and. whichdetermines V the number of sentby the distributors 6 and 7 IA similarmechanism (not shown) may be provided at station B for controlling thetransmission of impulses over conductor 5 from distributor 9 todistributor 8. The

mechanism 10 is preferably of 'a construc-- tion such as ,disclosediinthe above-men- 9o lmpulses tioned patent wherein controlling devices areset in accordance with the number of impulses to be sentand released bya means, including a key, under the control of the ends of conductor 5,a duplex system, pref- I erably of a type such as used in printingtelegraphy, is employed. This mechanism includes relays 11 and 12, oneof which is connected to each end of conductor 5 and energized when acall is initiated from the distant station.

It is believed that the invention will now be fully understood from adetailed description of the operation.

The operator at station A, upon receiving the number of the wanted linefrom a calling subscriber, inserts plug 13 into jack 14 of an idletelephone circuit and then proceeds to operate mechanism 10 in the samemanner as described in the previously mentioned co-pending application.As soon as the key of mechanism 10 is operated and the wiper ofdistributor 6 engages terminal 1 5, a circuit is closed extending fromgrounded battery, winding of relay 16, wiper of distributor 6, terminal15, jack 14:, sleeve of plug 13 and mechanism 10 to ground. This circuitis closed each time the wiper of distributor 6 engages terminal 15 totransmit the desired number of impulses over the controlling circuit orconductor 5 to operate a switch at station B and connect telephonecircuit 1 to the called line. Relay 16 is energized by the abovedescribed circuit and thereby closes a circuit which may be traced fromgrounded battery, resistance 17, armature of relay l6, make-before-breakcontact 18, windings of relay 11, conductor 5, windings of relay 12 andresistance 19 to ground. In accordance with the principle of the duplexsystem of telegraphy, relay 11 is not energized by this clrcuit, butrelay 12 at station B will operate. .By' attracting its armature,relayl2 establishes a circuit extending from grounded battery, armature andfront contact of relay 12, wiper of distributor 7 when the same engagesterminal 20, and winding of relay 21 to ground. Relay 21 is energizedand the operation thereof maybe utilized to control a switch (not shown)for stepping brushes 22 onto the terminals'of the wanted line. Theswitch may be of a construction such as that shown and described in theabove-mentioned patent and reference is made thereto for a detaileddescription of the operation of completing a connection.

Should the operator at station B desire a connection to station A, aplug (not shown) may be inserted into jack 23 of an idle telephonecircuit 3 and after setting and releasing the mechanism 10, whichis alsoassociated with the operators position B as previously referred to, acircuit will be closed for relay 24 extending from grounded battery,winding of said relay,'wiper of distributor 9 when the same engagesterminal 25, jack 23, sleeve of plug inserted therein and the mechanism10 at the operators position B to ground. Relay 24 energizes andestablishes a circuit extending from grounded battery, resistance 26,armature of relay 24, make-before-break contact 27, windings of relay12, conductor 5, windings of relay 11, and resistance 28 to ground. Inthis instance, relay 12 does not operate, but relay 11 will energize andclose a circuit from grounded battery, armature and front contact ofrelay 11, wiper of distributor 8, terminal 29 thereof, and winding ofrelay 30 to ground. Relay 30 energizes and may be employed in the samemanner as relay 21 to control the stepping of brushes 31 of a switch(not shown) onto the terminals to which a called line is connected.Relays 24 and 11 operate in response to each closure of the circuitthrough terminal 25 and wiper of distributor 9 to transmit the desirednumber of impulses to the switch.

By reason of the duplex arrangement including relays 11 and 12, it willbe obvious that impulses may be transmitted over conductor 5simultaneously in both directions whereby switches at stations A and Bmay be operated.

What is claimed is:

1. In a telephone system, two stations, a plurality of telephonecircuits extending be tween said stations, a controlling circuit commonto and independent of said circuits, switches at each station forcompleting connections with the other station over said telephonecircuits and means for simultaneously controlling switches at bothstations over said controlling circuit.

' 2. In a telephone system, two stations, a plurality of telephonecircuits extending between said stations, a controlling circuit commonto and independent of said telephone circuits, means at each station forcompleting connections with the other station over said telephonecircuits and means at each station for simultaneously controlling thelast named means at the other station over said controlling circuit.

3. In a telephone system, two stations, a plurality of telephonecircuits extending between said stations, a controlling circuit commonto and independent of said telephone circuits, means at each station forcompleting connections with the other station over said telephonecircuits and synchronously operable means at each station forsimultaneously controlling the last named means at the other stationover said controlling circuit.

4:. In a telephone system, two stations, a plurality of telephonecircuits extending between said stations, a controlling circuit commonto and independent of said telephone circuits, switches at each stationfor completing connections with the other station over said telephonecircuit, synchronized distributors at each station for transmittingimpulses over said controlling circuit to operate the switches at theother station and means permitting said distributors at both stations tooperate simultaneously to actuate the switches at both stations.

5. In a telephone system, two stations, a

plurality of telephone circuits extending between two stations, acontrolling circuit common to and independent of said telephonecircuits, switches at each station for completing connections with theother station over said telephone circuit, means at each station fortransmitting impulses over said controlling circuit to operate a switchat the other station and means permitting the last named means at bothstations to operate all switches simultaneously.

6. In a telephone system, two stations, a plurality of telephonecircuits interconnecting said stations, a controlling circuit common toand independent of said telephone circuits, a switch at each station forcompleting a connection with the other station over one of saidtelephone circuits, synchronized distributors at each station fortransmitting impulses over said controlling circuit to operate theswitch at the other station, and means permitting said distributors atboth stations to operate simultaneously.

7. In a telephone system, two stations a plurality of telephone circuitsextending between said stations, a controlling circuit common to andindependent of said circuits, automatic switches at each station forcompleting connections with the other station over said telephonecircuits, and means for controlling said automatic switches at bothstations over said controlling circuit.

8. An automatic telephone system comprising two stations, a plurality oftrans- IIllSlOIl o1rcu1ts interconnecting said stations, a controllingcircuit common to said transmission circuits, synchronized distributorsmission circuits interconnecting said stations, a controlling circuitcommon to said transmission circuits, synchronized distributorsassociated with said transmission circuits, a relay at each end of saidcontrolling circuit operable in response to series of impulsestransmitted over said controlling circuit from the other end thereof,switches responsive to the operation of said relays, and other relays,one at each station, responsive to said synchronized distributors forcontrolling the transmission of series of impulses over said controllingcircuits simultaneously in both directions. V

In witness whereof, we hereunto subscribe our names this 12th day ofDecember A. D., 1918.

HENRY P. CLAUSEN. CHARLES L. GOODRUM.

